Interacting with exchange through sign highlights the sign

It is possible to interact with ItemExchange chests by punching signs which are placed on those chests. In this case, the sign is highlighted by the mod rather than the chest itself.

It's possible that Tradex can't check what block the sign depends on without violating CivMC rules (since that would be reading block data). The ItemExchange messages don't appear to encode location data. In that case, it might be better to just ignore when players interact through signs, and force them to punch the actual chest?

This is bad because it can create duplicate entries in the search field if both chest and sign are tracked.